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for starters, disconnect any O2 sensor narrowband you have. Then see how the wideband responds.
Second. I dont see anything about cams. Stock cam? If so go to third
third, the wideband reading at first, looks bad/wrong. like you have an exhaust leak somewhere nearby. If not, then I would suspect a boost leak. You should have pressure tested the system with 15~psi first. If you did this, go to fourth
fourth, O2 narrowband still disconnected, no exhaust leaks, pressure test done, I suspect either bad maf (try cleaning it) or poor ECU config (tune related) or an injector leak.
The misfire symptom is because the fuel is going all over the place. The fuel is going all over the place because something in the chain of command (maf -> ecu -> injector) isn't right.
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